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TransactionRunner (Oracle - Berkeley DB Java API)
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com.sleepycat.collections</FONT>
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Class TransactionRunner</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
  <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.sleepycat.collections.TransactionRunner</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>TransactionRunner</B><DT>extends <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL>
</PRE>

<P>
Starts a transaction, calls <A HREF="../../../com/sleepycat/collections/TransactionWorker.html#doWork()"><CODE>TransactionWorker.doWork()</CODE></A>, and handles
 transaction retry and exceptions.  To perform a transaction, the user
 implements the <A HREF="../../../com/sleepycat/collections/TransactionWorker.html" title="interface in com.sleepycat.collections"><CODE>TransactionWorker</CODE></A> interface and passes an instance of
 that class to the <A HREF="../../../com/sleepycat/collections/TransactionRunner.html#run(com.sleepycat.collections.TransactionWorker)"><CODE>run(com.sleepycat.collections.TransactionWorker)</CODE></A> method.

 <p>A single TransactionRunner instance may be used by any number of threads
 for any number of transactions.</p>

 <p>The behavior of the run() method depends on whether the environment is
 transactional, whether nested transactions are enabled, and whether a
 transaction is already active.</p>

 <ul>
 <li>When the run() method is called in a transactional environment and no
 transaction is active for the current thread, a new transaction is started
 before calling doWork().  If DeadlockException is thrown by doWork(), the
 transaction will be aborted and the process will be repeated up to the
 maximum number of retries.  If another exception is thrown by doWork() or
 the maximum number of retries has occurred, the transaction will be aborted
 and the exception will be rethrown by the run() method.  If no exception is
 thrown by doWork(), the transaction will be committed.  The run() method
 will not attempt to commit or abort a transaction if it has already been
 committed or aborted by doWork().</li>

 <li>When the run() method is called and a transaction is active for the
 current thread, and nested transactions are enabled, a nested transaction is
 started before calling doWork().  The transaction that is active when
 calling the run() method will become the parent of the nested transaction.
 The nested transaction will be committed or aborted by the run() method
 following the same rules described above.  Note that nested transactions may
 not be enabled for the JE product, since JE does not support nested
 transactions.</li>

 <li>When the run() method is called in a non-transactional environment, the
 doWork() method is called without starting a transaction.  The run() method
 will return without committing or aborting a transaction, and any exceptions
 thrown by the doWork() method will be thrown by the run() method.</li>

 <li>When the run() method is called and a transaction is active for the
 current thread and nested transactions are not enabled (the default) the
 same rules as above apply. All the operations performed by the doWork()
 method will be part of the currently active transaction.</li>
 </ul>

 <p>In a transactional environment, the rules described above support nested
 calls to the run() method and guarantee that the outermost call will cause
 the transaction to be committed or aborted.  This is true whether or not
 nested transactions are supported or enabled.  Note that nested transactions
 are provided as an optimization for improving concurrency but do not change
 the meaning of the outermost transaction.  Nested transactions are not
 currently supported by the JE product.</p>
<P>

<P>
<HR>

<P>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#DEFAULT_MAX_RETRIES">DEFAULT_MAX_RETRIES</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The default maximum number of retries.</TD>
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<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#TransactionRunner(com.sleepycat.db.Environment)">TransactionRunner</A></B>(<A HREF="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</A>&nbsp;env)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a transaction runner for a given Berkeley DB environment.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#TransactionRunner(com.sleepycat.db.Environment, int, com.sleepycat.db.TransactionConfig)">TransactionRunner</A></B>(<A HREF="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</A>&nbsp;env,
                  int&nbsp;maxRetries,
                  <A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A>&nbsp;config)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a transaction runner for a given Berkeley DB environment and
 with a given number of maximum retries.</TD>
</TR>
</TABLE>
&nbsp;
<!-- ========== METHOD SUMMARY =========== -->

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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#getAllowNestedTransactions()">getAllowNestedTransactions</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns whether nested transactions will be created if
 <code>run()</code> is called when a transaction is already active for
 the current thread.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#getMaxRetries()">getMaxRetries</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the maximum number of retries that will be performed when
 deadlocks are detected.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#getTransactionConfig()">getTransactionConfig</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the transaction configuration used for calling
 <A HREF="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)"><CODE>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</CODE></A>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#run(com.sleepycat.collections.TransactionWorker)">run</A></B>(<A HREF="../../../com/sleepycat/collections/TransactionWorker.html" title="interface in com.sleepycat.collections">TransactionWorker</A>&nbsp;worker)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Calls the <A HREF="../../../com/sleepycat/collections/TransactionWorker.html#doWork()"><CODE>TransactionWorker.doWork()</CODE></A> method and, for transactional
 environments, may begin and end a transaction.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#setAllowNestedTransactions(boolean)">setAllowNestedTransactions</A></B>(boolean&nbsp;allowNestedTxn)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Changes whether nested transactions will be created if
 <code>run()</code> is called when a transaction is already active for
 the current thread.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#setMaxRetries(int)">setMaxRetries</A></B>(int&nbsp;maxRetries)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Changes the maximum number of retries that will be performed when
 deadlocks are detected.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#setTransactionConfig(com.sleepycat.db.TransactionConfig)">setTransactionConfig</A></B>(<A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A>&nbsp;config)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Changes the transaction configuration used for calling
 <A HREF="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)"><CODE>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</CODE></A>.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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&nbsp;
<P>

<!-- ============ FIELD DETAIL =========== -->

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<A NAME="DEFAULT_MAX_RETRIES"><!-- --></A><H3>
DEFAULT_MAX_RETRIES</H3>
<PRE>
public static final int <B>DEFAULT_MAX_RETRIES</B></PRE>
<DL>
<DD>The default maximum number of retries.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../constant-values.html#com.sleepycat.collections.TransactionRunner.DEFAULT_MAX_RETRIES">Constant Field Values</A></DL>
</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

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<B>Constructor Detail</B></FONT></TH>
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<A NAME="TransactionRunner(com.sleepycat.db.Environment)"><!-- --></A><H3>
TransactionRunner</H3>
<PRE>
public <B>TransactionRunner</B>(<A HREF="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</A>&nbsp;env)</PRE>
<DL>
<DD>Creates a transaction runner for a given Berkeley DB environment.
 The default maximum number of retries (<A HREF="../../../com/sleepycat/collections/TransactionRunner.html#DEFAULT_MAX_RETRIES"><CODE>DEFAULT_MAX_RETRIES</CODE></A>) and
 a null (default) <A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db"><CODE>TransactionConfig</CODE></A> will be used.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>env</CODE> - is the environment for running transactions.</DL>
</DL>
<HR>

<A NAME="TransactionRunner(com.sleepycat.db.Environment, int, com.sleepycat.db.TransactionConfig)"><!-- --></A><H3>
TransactionRunner</H3>
<PRE>
public <B>TransactionRunner</B>(<A HREF="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</A>&nbsp;env,
                         int&nbsp;maxRetries,
                         <A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A>&nbsp;config)</PRE>
<DL>
<DD>Creates a transaction runner for a given Berkeley DB environment and
 with a given number of maximum retries.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>env</CODE> - is the environment for running transactions.<DD><CODE>maxRetries</CODE> - is the maximum number of retries that will be
 performed when deadlocks are detected.<DD><CODE>config</CODE> - the transaction configuration used for calling
 <A HREF="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)"><CODE>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</CODE></A>, or null to use the default
 configuration.  The configuration object is not cloned, and
 any modifications to it will impact subsequent transactions.</DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

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<B>Method Detail</B></FONT></TH>
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<A NAME="getMaxRetries()"><!-- --></A><H3>
getMaxRetries</H3>
<PRE>
public int <B>getMaxRetries</B>()</PRE>
<DL>
<DD>Returns the maximum number of retries that will be performed when
 deadlocks are detected.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="setMaxRetries(int)"><!-- --></A><H3>
setMaxRetries</H3>
<PRE>
public void <B>setMaxRetries</B>(int&nbsp;maxRetries)</PRE>
<DL>
<DD>Changes the maximum number of retries that will be performed when
 deadlocks are detected.
 Calling this method does not impact transactions already running.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getAllowNestedTransactions()"><!-- --></A><H3>
getAllowNestedTransactions</H3>
<PRE>
public boolean <B>getAllowNestedTransactions</B>()</PRE>
<DL>
<DD>Returns whether nested transactions will be created if
 <code>run()</code> is called when a transaction is already active for
 the current thread.
 By default this property is false.

 <p>Note that this method always returns false in the JE product, since
 nested transactions are not supported by JE.</p>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="setAllowNestedTransactions(boolean)"><!-- --></A><H3>
setAllowNestedTransactions</H3>
<PRE>
public void <B>setAllowNestedTransactions</B>(boolean&nbsp;allowNestedTxn)</PRE>
<DL>
<DD>Changes whether nested transactions will be created if
 <code>run()</code> is called when a transaction is already active for
 the current thread.
 Calling this method does not impact transactions already running.

 <p>Note that true may not be passed to this method in the JE product,
 since nested transactions are not supported by JE.</p>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getTransactionConfig()"><!-- --></A><H3>
getTransactionConfig</H3>
<PRE>
public <A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A> <B>getTransactionConfig</B>()</PRE>
<DL>
<DD>Returns the transaction configuration used for calling
 <A HREF="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)"><CODE>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</CODE></A>.

 <p>If this property is null, the default configuration is used.  The
 configuration object is not cloned, and any modifications to it will
 impact subsequent transactions.</p>
<P>
<DD><DL>

<DT><B>Returns:</B><DD>the transaction configuration.</DL>
</DD>
</DL>
<HR>

<A NAME="setTransactionConfig(com.sleepycat.db.TransactionConfig)"><!-- --></A><H3>
setTransactionConfig</H3>
<PRE>
public void <B>setTransactionConfig</B>(<A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A>&nbsp;config)</PRE>
<DL>
<DD>Changes the transaction configuration used for calling
 <A HREF="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)"><CODE>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</CODE></A>.

 <p>If this property is null, the default configuration is used.  The
 configuration object is not cloned, and any modifications to it will
 impact subsequent transactions.</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>config</CODE> - the transaction configuration.</DL>
</DD>
</DL>
<HR>

<A NAME="run(com.sleepycat.collections.TransactionWorker)"><!-- --></A><H3>
run</H3>
<PRE>
public void <B>run</B>(<A HREF="../../../com/sleepycat/collections/TransactionWorker.html" title="interface in com.sleepycat.collections">TransactionWorker</A>&nbsp;worker)
         throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A>,
                <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></PRE>
<DL>
<DD>Calls the <A HREF="../../../com/sleepycat/collections/TransactionWorker.html#doWork()"><CODE>TransactionWorker.doWork()</CODE></A> method and, for transactional
 environments, may begin and end a transaction.  If the environment given
 is non-transactional, a transaction will not be used but the doWork()
 method will still be called.  See the class description for more
 information.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db">DeadlockException</A></CODE> - when it is thrown by doWork() and the
 maximum number of retries has occurred.  The transaction will have been
 aborted by this method.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></CODE> - when any other exception is thrown by doWork().  The
 exception will first be unwrapped by calling <A HREF="../../../com/sleepycat/util/ExceptionUnwrapper.html#unwrap(java.lang.Exception)"><CODE>ExceptionUnwrapper.unwrap(java.lang.Exception)</CODE></A>.  The transaction will have been aborted by
 this method.
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